<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" placeholder="用户名" v-model="user.username">
    <input type="text" placeholder="密码" v-model="user.password">
    <input type="button" value="登录" @click="f1()">
</div>

<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
    <script>

            let v=new Vue({
                    el:"body>div",
                    data:{
                        user:{
                            username:"",password:""
                        }
                    },
                    methods:{
                        f1(){
                            axios.post("/login",v.user).then(function (response) {
                                if(response.data==1){
                                    alert("登陆成功！")
                                }else if(response.data==2){
                                    alert("用户名不存在！")
                                }else {
                                    alert("密码错误！")
                                }
                            })
                        }
                    }
                })

    </script>
</body>
</html>